The Centers for Disease Control (CDC) published data on the body dimensions of pediatric patients in 2000. This included data on the head circumference of girls aged from 0 to 36 months.
Equations derived in JMP
predicted head circumference in cm =
= (A * ((age in months)^3)) + (B * ((age in months)^2)) + (C * (age in months)) + D
NOTE: The tables should be validated prior to clinical use.
|
interval in months |
percentile |
((age in months)^3) |
((age in months)^2) |
(age in months) |
constant |
|
0 - 6.5 |
3rd |
0.0235334 |
-0.390439 |
2.8470975 |
31.984597 |
|
|
5th |
0.0234911 |
-0.387804 |
2.8254365 |
32.3041 |
|
|
10th |
0.022459 |
-0.374713 |
2.7704496 |
32.811763 |
|
|
25th |
0.0217361 |
-0.36225 |
2.6949992 |
33.703061 |
|
|
50th |
0.0209015 |
-0.347487 |
2.60271 |
34.756516 |
|
|
75th |
0.0195853 |
-0.32756 |
2.4887708 |
35.89737 |
|
|
90th |
0.0186347 |
-0.310932 |
2.3798104 |
36.992726 |
|
|
95th |
0.0181566 |
-0.301954 |
2.3122802 |
37.693637 |
|
|
97th |
0.0176256 |
-0.293347 |
2.2588248 |
38.16066 |
|
6.5 - 18.5 |
3rd |
0.000845 |
-0.047641 |
1.0701884 |
35.266481 |
|
|
5th |
0.000833 |
-0.046994 |
1.0633981 |
35.560884 |
|
|
10th |
0.00081 |
-0.046 |
1.0552221 |
36.00162 |
|
|
25th |
0.0007838 |
-0.044672 |
1.0419469 |
36.769522 |
|
|
50th |
0.0007751 |
-0.043895 |
1.0313347 |
37.653801 |
|
|
75th |
0.0007547 |
-0.042616 |
1.0110151 |
38.618993 |
|
|
90th |
0.0006789 |
-0.039235 |
0.9623727 |
39.64079 |
|
|
95th |
0.000676 |
-0.038566 |
0.9451157 |
40.239107 |
|
|
97th |
0.0006294 |
-0.036603 |
0.9171354 |
40.688646 |
|
18.5 - 36 |
3rd |
0.0000922 |
-0.01079 |
0.4601539 |
38.696642 |
|
|
5th |
0.0000774 |
-0.009486 |
0.4278938 |
39.26271 |
|
|
10th |
0.0000739 |
-0.009288 |
0.4320802 |
39.618456 |
|
|
25th |
0.0000748 |
-0.009293 |
0.4404233 |
40.270971 |
|
|
50th |
0.0000822 |
-0.009881 |
0.4647156 |
40.87675 |
|
|
75th |
0.000082 |
-0.009774 |
0.4672098 |
41.69091 |
|
|
90th |
0.0000689 |
-0.008662 |
0.4423788 |
42.655702 |
|
|
95th |
0.0000568 |
-0.007567 |
0.412934 |
43.393057 |
|
|
97th |
0.0000657 |
-0.008211 |
0.4295823 |
43.557552 |
